WO2017026639A1

WO2017026639A1 - Variable displacement gear pump

Info

Publication number: WO2017026639A1
Application number: PCT/KR2016/006390
Authority: WO
Inventors: 장순길
Original assignee: 장순길
Priority date: 2015-08-12
Filing date: 2016-06-16
Publication date: 2017-02-16

Abstract

The present invention relates to a variable displacement gear pump. The variable displacement gear pump, according to the present invention, moves one of the two gears which are engaged with each other inside a casing of a gear pump in the related art in the axial direction to vary the width by which the two gears are engaged with each other, thereby regulating a discharge rate. A gear ring for preventing fluid leakage is installed between a casing cover and the gear that moves outward from the casing according to the movement of the gear, or between the gear and a gear block, and a gear block for preventing fluid leakage is installed between the gear and the casing, or between the gear and a side surface of the gear. Further, a gear block hole through which the gear block passes is provided if necessary. The variable displacement gear pump, according to the present invention, can be used as a variable displacement gear motor as it is and can be used for a continuously variable transmission, a power distribution device, and the like.

Description

Variable displacement gear pump

Hydraulic pumps or hydraulic motors can be made using vanes, pistons, gears, etc. and have different characteristics. Hydraulic pumps and hydraulic motors that use gears have more difficulty in making variable displacement types than vanes or pistons.

Hydraulic gear pump and hydraulic gear motor have the same basic structure and can be divided into external type, internal type and trocoid type. In the sense of the present invention, the structure of the lobe pump is the same as the external gear pump. The hydraulic gear pump creates a flow of fluid by repeating gear and gear engagement and disengagement, and the flow rate is proportional to the width of the gear and the mesh of the gear, so that if the gear and the gear mesh can be changed, the discharge amount can be changed. do. Changing the width at which the gears mesh with one another can be easily achieved by moving the two gears in opposite directions in the axial direction. On the other hand, it is a problem to be solved that the two relatively shifting gears do not leak the fluid to the unwanted place. For parts where the gears move in the axial direction and are not engaged with each other on either side, use one ring to fit inside or outside one of the parts so that fluid does not leak between the teeth and the teeth of the gear A block that prevents fluid from leaking between the teeth and the teeth of each gear by inserting two rings on the outside or inside of each of the two parts, or contacting the teeth, sleeves, grooves, etc. of the gear Many attempts have been made to prevent fluid leakage by using one or more, or one or more sleeves surrounding gears, shafts, blocks, and the like. There were several types of rings used, such as holes, allowing fluid to pass through. However, looking at the conventional methods disclosed, the structure is so complex that it is very difficult to make a variable displacement gear pump, missed the hidden problem and solved it, or it tended to be expensive to manufacture and maintain, and therefore vane type. In many cases, it could not attract attention because it was not competitive compared to a variable displacement pump made of a piston and a piston type. The present invention solves the problems found so far with the subsequent inventions of Republic of Korea Publication No. 1020140140011 and WO 2014178483.

It is an object of the present invention to provide a simple method of preventing a fluid from leaking into an undesired place by using a gear ring and a gear block when the gear is moved axially in order to change the gear engagement width in a variable displacement gear pump. Is in. It is to ensure that the main features of the gear pump's simple structure and economy remain in the variable displacement gear pump. This will make it easier to commercially manufacture variable displacement gear pumps and variable displacement gear motors that are more competitive than vane or piston types. Hereinafter, the hydraulic gear pump and the hydraulic gear motor will be referred to as both the hydraulic gear pump and the hydraulic gear motor as the hydraulic gear pump without separately mentioning them.

The present invention for achieving the above object uses the following means.

In the case of a variable displacement external gear pump, one gear in the casing is rotated in a fixed position, and the other gear in rotation rotates in the axial direction to adjust the discharge amount by changing the width where the two gears are engaged, but between the gear and the casing There is a gear block between the gear block and the gear block hole, the gear and the casing cover to prevent the leakage of fluid,

In the case of the variable-capacity trocoid gear pump, one gear is rotated in a fixed position inside the casing, and the other gear rotated in the axial direction is moved in the axial direction to adjust the discharge amount by changing the width in which the two gears are engaged. Between the and the casing cover gear ring, the gear ring and the gear block is installed on the side of the gear moving in the gear rotating in a fixed position to prevent the leakage of fluid,

In the case of the variable capacity internal gear pump, one gear is rotated in a fixed position inside the casing, and the other gear that is engaged and rotated moves in the axial direction to adjust the discharge amount by changing the width in which the two gears are engaged, but the moving gear Between the and casing cover, gear ring and gear block are installed on the side of the moving gear in the fixed gear to prevent the leakage of fluid, and the crescent plate is divided into the fixed gear and the moving gear, respectively. Move through the crescent plate hole.

Minimal changes to the simple construction of a hydraulic gear pump or hydraulic gear motor allow the creation of competitive variable displacement gear pumps or variable displacement gear motors that are easy to manufacture and maintain and inexpensive. Not only can be used alone as a variable displacement gear pump and a variable displacement gear motor, but it can also be used in various ways in connection with a continuously variable transmission, a continuously variable power distribution device, and the like.

1 shows a fixed gear ring 11, a moving gear ring 12, a fixed gear 14 and a moving gear 13 used in a variable displacement external gear pump. The fixed gear ring 11 can be fitted to the moving gear 13 to move from side to side, and the movable gear ring 12 can be fitted to the fixed gear 14 to move from side to side, and fluid will not leak when moving.

2 shows a casing 22, a fixed cover 21, a moving cover 23, a moving gear block 24, and a moving gear block hole 27 used in a variable displacement external gear pump. The moving gear block 24 is attached to the moving cover 23 and moves in contact with the ceiling inside the casing 22 and will penetrate the moving gear block hole 27.

3 shows a cross section of a variable displacement external gear pump in an assembled state of operation.

4 is a cross-sectional view taken along the arrow 31 of FIG. 3.

5 is a cross-sectional view taken along the arrow 32 of FIG. 3.

FIG. 6 is a cross-sectional view taken along the arrow 33 of FIG. 3.

FIG. 7 is a cross-sectional view taken along the arrow 34 of FIG. 3.

FIG. 8 shows a variation of the variable displacement external gear pump shown in FIGS. 1 to 7. Here, the fixed gear block 85 is used together with the moving gear block 86. Both gears should be submerged in fluid, and the casing has no top and side, only bottom.

FIG. 9 shows two methods of decorating the continuously variable transmission using the variable displacement external gear pump shown in FIG. 8. In the figure on the right, four gears and four gear rings are omitted and not shown for simplicity.

10 shows a fixed gear ring 101, a shift gear 102, a shift gear shaft 103, a shift gear auxiliary shaft 107, a fixed gear 104, and a shift gear ring 105 used in a variable displacement trocoid gear pump. ), Gear block 106, gear block hole 108, and gear block fixing device 109 are shown. The fixed gear ring 101 is fitted to the outside of the moving gear 102 to move from side to side, and fluid does not leak when moving. The moving gear ring 105 can be assembled with the gear block 106 to be inserted into the fixed gear 104 to move to the left and right in contact with the right side of the moving gear 102, and when the fluid moves, fluid between the fixed gear 104 and the fixed gear 104 moves. Not leaking

11 shows a gear ring cover 111, a casing 112, a gear block cover 113, an inlet cover 114 and an outlet cover 115 for use in a variable displacement trocoid gear pump.

Figure 12 shows a cross section of a variable displacement trocoid gear pump in an assembled state of operation. A cross section cut at the arrow 141 of FIG. 14 is shown.

FIG. 13 is a cross-sectional view taken along the arrow 121 of FIG. 12.

FIG. 14 is a cross-sectional view taken along the arrow 122 of FIG. 12.

FIG. 15 is a cross-sectional view taken along the arrow 123 of FIG. 12.

16 is a cross-sectional view taken along the arrow 124 of FIG. 12.

17 is a cross-sectional view taken along the arrow 125 of FIG. 12.

18 shows a fixed gear 181 used in a variable displacement internal gear pump.

19 shows a gear block 191, a moving crescent plate 192, a moving gear ring 193, and a departure prevention plate 194 used in a variable displacement internal gear pump. The moving crescent plate 192 is attached to the gear block 191, and directly above the moving crescent plate 192 of the gear block 191 is a fixed crescent plate hole 196 through which the fixed crescent plate 214 will pass. The departure prevention plate 194 also has a fixed crescent plate hole 197.

20 shows a fixed gear ring 201 and a moving gear 202 used in a variable displacement internal gear pump. The fixed gear ring 201 is fitted to the outside of the moving gear 202 to move from side to side, and fluid does not leak when moving. The moving gear 202 may be fixed to the moving gear shaft 203 to rotate together as necessary, or may not be fixed so as not to rotate together.

FIG. 21 shows a casing 211, a casing cover 212, a fixed gear ring cover 213, a fixed crescent plate 214 and a moving crescent plate hole 217 used in a variable displacement internal gear pump. The fixed crescent plate 214 is attached to the fixed gear ring cover 213, and immediately below the fixed crescent plate 214 of the fixed gear ring cover 213, the moving crescent plate hole 217 through which the moving crescent plate 192 will pass There is. The gear block 191 already shown in FIG. 19 is again shown assembled to the moving gear ring 193. The fixed crescent plate 214 and the moving crescent plate 192 move in contact with each other.

FIG. 22 may be used to make irregularities such as the moving crescent plate concave row 221 and the fixed crescent plate convex row 222 so that the fixed crescent plate 214 and the moving crescent plate 192 do not deviate from each other when moving in contact with each other. have.

FIG. 23 shows a cross section of a variable displacement internal gear pump in an assembled state of operation. 25 is a cross-sectional view taken along the arrow 251 of FIG.

24 is a cross-sectional view taken along the arrow 231 of FIG. 23.

25 is a cross-sectional view taken along the arrow 232 of FIG.

FIG. 26 is a cross-sectional view taken along the arrow 233 of FIG. 23.

FIG. 27 is a cross-sectional view taken along the arrow 234 of FIG.

FIG. 28 is a cross-sectional view taken along the arrow 235 of FIG.

29 shows a passage of fluid leakage in a conventional variable displacement external gear pump.

FIG. 30 shows one method for decorating the endless power distribution apparatus using the variable displacement external gear pump shown in FIG. 8.

31 shows a fixed gear 311 used in a variable displacement internal gear pump. There is no fixed gear shaft 182 compared with FIG. 18, and the center of the fixed gear plate 313 is drilled.

32 shows a gear block 321, a moving crescent plate 322, a moving gear ring 193, a departure preventing plate 324, a gear block support plate 328 and a gear block support plate hole (used in a variable displacement internal gear pump). 329). The gear block support plate 328 is attached to the gear block 321 and penetrates through the gear block support plate hole 329 in the deviation preventing plate 324.

33 shows a fixed gear ring 201 and a moving gear 332 for use in a variable displacement internal gear pump. Compared with FIG. 20, the moving gear shaft 333 is longer.

34 shows a casing 211, a casing cover 342, a fixed gear ring cover 213, a fixed crescent plate 214, a gear block 321, a moving crescent plate 322 used for a variable displacement internal gear pump, The gear block support plate 328 attached to the moving gear ring 193 and the gear block 321 and the gear block support plate hole 348 in the casing cover 342 are shown. The gear block support plate 328 will move through the gear block support plate hole 348 in the casing cover 342.

35 is the same as that shown in FIG. 22.

36 shows a cross section of a variable displacement internal gear pump in an assembled state of operation. 38 is a cross-sectional view taken along the arrow 381.

FIG. 37 is a cross-sectional view taken along the arrow 361 of FIG. 36.

38 is a cross-sectional view taken along the arrow 362 of FIG. 36.

39 is a cross-sectional view taken along the arrow 363 of FIG.

40 is a cross-sectional view taken along the arrow 364 of FIG. 36.

41 is a cross-sectional view taken along the arrow 365 of FIG. 36.

FIG. 42 shows another variation of the variable displacement external gear pump shown in FIGS. 1 to 7. Here, the fixed gear block 425 and the moving gear block 426 which the side surfaces touch each other are used. Both gears must be submerged in fluid and do not use casings.

FIG. 43 shows another variation of the variable displacement external gear pump shown in FIGS. 1 to 7. Here, the moving gear block 24 and the moving gear block hole 27 are not used, but the moving casing 434 is used instead.

44 shows a sectional view according to FIG. 43.

45 shows another variation of the variable displacement external gear pump shown in FIGS. 1 to 7. Here, the casing 22, the moving gear block 24, the moving gear block hole 27 are not used, and instead, the fixed casing 455 and the moving casing 456 are used.

Since the hydraulic gear pump and the hydraulic gear motor have the same basic structure, the description of the hydraulic gear pump is replaced with the description of the hydraulic gear motor. In general, external gear, internal gear and trocoid type are used for the hydraulic gear pump. The description of the lobe pump is replaced with an external type description. The present invention provides the structure and method of each variable displacement gear pump for these three forms.

1 shows a fixed gear ring 11, a moving gear ring 12, a fixed gear 14, and a moving gear 13 constituting a variable displacement external gear pump, and FIG. 2 shows a casing 22 and a fixed cover. 21, the movement cover 23, and the movement gear block hole 27 are shown. A part of the casing 22 where the end of the moving gear is in contact with the fixed casing 28 is called. The fixed gear 14 is fitted with the moving gear ring 12 and installed using the small hole of the fixed cover 21 and the large hole of the moving cover 23, and the moving gear 13 is fixed gear ring 11. And insert it using the large hole of the fixed cover 21 and the small hole of the movable cover 23. The fixed gear ring 11 rotates in the large hole of the fixed cover 21, and the fixed cover 21 is attached in front of the casing 22. The moving gear ring 12 rotates in the large hole of the moving cover 23, and the moving cover 23 moves left and right inside the casing 22. The shifting gear block 24 is attached to the shifting cover 23, upwardly touching the ceiling of the casing 22 and downwardly touching the end of the fixed gear 14, shifting gear in the fixed cover 21. It moves through the block hole 27. The moving gear 13 is engaged with the stationary gear 14 from the inside of the casing 22 upwards, and the ends thereof are in contact with the casing 22. As the moving gear 13, the moving gear ring 12, the moving gear block 24, and the moving cover 23 move left and right together, the width at which the two gears are engaged is changed to change the discharge amount. The casing 22 of FIG. 2 is close to a rectangular parallelepiped for ease of drawing and understanding. The shape of the cross section of the moving gear block 24 and the shape of the moving gear block hole 27 according to this are for the moving gear block 24 to abut on the end of the fixed gear 14 and to the casing 22. It is not limited to that shown in 2. Where the end of the moving gear 13 is in contact with the casing 22 is not limited to the bottom of the casing 22, and where the moving gear block 24 is in contact with the casing 22 is limited to the ceiling of the casing 22. It doesn't work. If the end of the moving gear 13 is in contact with the casing 22 and the moving gear block 24 is in contact with the casing 22, the casing 22 has a top, bottom, left and right as shown in FIG. You can also reduce some. For example, if the installation site of the variable displacement external gear pump is at the bottom of the fluid tank or at the bottom of the crankcase of the internal combustion engine, the shifting gear 13 and the fixed gear 14 are arranged horizontally and the gear is submerged in the fluid. The casing 22 needs only one bottom. This can be done by shifting the positions of the fixed gear 14 and the moving gear block 24 in Figs. 1 to 7 laterally as in the positions of the fixed gear 84 and the moving gear block 86 shown in Fig. 8. 8 illustrates the case where the fixed gear block 85 and the fixed gear block hole 73 are further used. In some cases, it may be difficult to precisely machine the floor. In this case, a pump made without the bottom is shown in FIG. 43 and 44 show a method of not using the gear block and the gear block hole. In addition, a method of not using a casing is shown in FIG.

The variable displacement external gear pump according to the invention uses respective gear rings for two gears. In the conventional external gear pump, the gear block is placed between the two at the position where the end of the gear and the casing directly contact each other. The gear block hole is a hole through which the gear block passes. The gear block may be placed between one gear and the casing, or between the two gears and the casing, respectively, or may not be used. The variable displacement external gear pump described in FIGS. 1 to 7 is applied to only one gear, and the variable displacement external gear pump shown in FIGS. 8, 9 and 42 is applied to both gears. What is shown is not applied.

3 shows a cross section of the assembled variable displacement external gear pump in operation. In order to show the assembly and the operation state in more detail, the cross sections seen from the arrow positions 31 to 34 are shown again in FIGS. 4 to 7, respectively.

4 is a cross-sectional view taken at the arrow 31 in FIG. 3, in which the fixed gear ring 11 is contained in the large hole of the fixed cover 21, and the moving gear 13 is inserted therein. The fixed gear shaft 15 penetrates through the small hole of the fixed cover 21, and the moving gear block 24 also penetrates the moving gear block hole 27 in the fixed cover 21. As shown in FIG.

FIG. 5 is a cross-sectional view taken along the arrow 32 in FIG. 3, in which the fixed gear 14 and the moving gear 13 are engaged in the casing 22, and the moving gear block 24 above the fixed gear 14. You can see that it is touching.

FIG. 6 is a cross-sectional view taken at the arrow 33 position in FIG. 3, in which the moving cover 23 is located in the casing 22, and the moving gear ring 12 is contained in the large hole of the moving cover 23, and fixed thereto. It can be seen that the gear 14 is fitted. The moving gear shaft 16 penetrates through the small hole of the moving cover 23.

FIG. 7 is a cross-sectional view taken at the arrow 34 position of FIG. 3, in which the fixed gear 14 and the moving gear shaft 16 can be seen in the casing 22.

It can be seen from FIG. 3 to FIG. 6 that the fluid does not leak, and it can be seen from FIG. 5 that the fluid flows when the gear rotates, and the moving gear 13 and the moving gear ring 12 in the casing 22. ), It can be confirmed that the discharge amount can be adjusted by adjusting the positions of the moving gear block 24 and the moving cover 23.

8 shows a variant of the variable displacement external gear pump shown in FIGS. 1 to 7. Compared to the variable displacement external gear pump shown in FIGS. 1 to 7, gear blocks and gear block holes have been added and the arrangement has changed. The variable displacement external gear pump of FIG. 8 can be easily installed on the bottom of the oil tank or the bottom of the crankcase without the upper and side surfaces of the casing. If there is no upper and side surfaces of the casing, the two gears should be operated while fully submerged in the fluid, and the fluid hole 87 may be used as a discharge port or a suction port by connecting pipes.

9 shows two examples of the method of using the variable displacement external gear pump shown in FIG. 8 in a continuously variable transmission. The continuously variable transmission may be used by connecting a hydraulic pump and a hydraulic motor, but one or two may be variable capacitive type, but when both are variable capacitive type, the performance is better. The method shown in the left figure of FIG. 9 is connected to the two through the fluid pipe 91 by applying the example of FIG. 8 as it is, and the method shown in the right figure installs a partition wall 92 between the pump and the motor. It is shown that instead of the fluid pipe 91 shown in the left figure by drilling the fluid hole 93 in 92, the use space is also reduced. The picture on the right does not show four gears and four gear rings for convenience. In the absence of the top and sides of the casing, gears should be sufficiently submerged. For the manner shown in the left and right figures of FIG. 9, each variable displacement external gear pump is not limited to the variable displacement external gear pump shown in FIG. 8, but is not limited to the variable displacement external gear pump shown in FIGS. The variable displacement external gear pump shown or the variable displacement external gear pump shown in Figs. 43 to 45 may be used.

30 shows an example of using the variable displacement external gear pump shown in FIG. 8 in an endless power distribution device. Two moving

gears

303 and 319 mesh with one fixed gear 304, and the discharge amount of the two

fluid holes

307 and 317 as the moving cover 302 moves along the moving direction 308 of the moving cover. This is different by connecting two

fluid holes

307 and 317 to the respective hydraulic motors. The fixed gear 304 and the moving

gear

303, 319 must be immersed in the fluid, and the fluid must be in contact with the teeth of the three

gears

304, 303, 319 and the gear blocks 305, 306, 316. Inhaled by rotation. In addition, the variable displacement external gear pump which can be used here is not limited to what was shown in FIG. 8, The variable displacement external gear pump shown in FIGS. 1-7, the variable displacement external gear pump shown in FIG. 42, or 43-45 is shown in FIG. It is also possible to use the variable displacement external gear pump shown.

10, the fixed gear ring 101, the shift gear 102, the shift gear shaft 103, the fixed gear 104, the shift gear ring 105, the gear block 106, which constitute a variable displacement trocoid gear pump, The moving gear auxiliary shaft 107, the gear block hole 108, and the gear block fixing device 109 are shown, and FIG. 11 shows the gear ring cover 111, the casing 112, the gear block cover 113, and the inlet cover. 114, the discharge port cover 115, the suction port 116, and the discharge port 117 are shown. The shifting gear 102, the shifting gear ring 105, and the gear block 106 abut in the fixed gear 104 and move left and right together, and the shifting gear 102 and the shifting gear ring 105 are fixed gear 104. And the fixed gear ring 101 is rotated in the hole of the gear ring cover 111 by being fitted to the outside of the moving gear 102, the gear block 106 is in contact with both ends of the fixed gear 104 It moves through the hole of the block cover 113. As the moving gear 102, the moving gear ring 105, and the gear block 106 move left and right together, the width at which the two gears are engaged is changed to change the discharge amount. The teeth used for the moving gear 102 and the fixed gear 104 are not limited to trocoids.

12 shows a cross section of the assembled variable displacement trocoid gear pump in operation. It is a cross section cut at the arrow position of 141 of FIG. In order to show the assembly and operation state in more detail, the cross sections seen from the arrow positions 121 to 125 are shown again in FIGS. 13 to 17, respectively.

FIG. 13 is a cross-sectional view taken along the arrow 121 of FIG. 12, wherein the fixed gear ring 101 is inserted into the hole of the gear ring cover 111, and the movable gear 102 is fitted into the fixed gear ring 101. can see.

FIG. 14 is a cross-sectional view taken along the arrow 122 of FIG. 12, in which a fixed gear 104 is included in the casing 112, and the moving gear 102 is engaged with the fixed gear 104 to rotate. . When it rotates, it acts as a pump. The moving gear ring 105 indicated by the dotted line is only shown to confirm the relative position of the moving gear ring 105 and is actually at the position where the moving gear 102 ends, where the moving gear ring 105 is located. And the shape of the gear block 106 can be seen in FIG. The movable gear ring 105 blocks the periphery of the end of the contact where the fixed gear 104 and the movable gear 102 are in contact with each other, thereby preventing the formation of a leak passage of the fluid described in FIG. 29.

FIG. 15 is a cross-sectional view taken along the arrow 123 of FIG. 12. The fixed gear 104 is inserted into the casing 112, and the movable gear ring 105 is fitted into the fixed gear 104. It can be seen that the gear block 106 is assembled at the center of the 105, and the left and right sides of the gear block 106 are empty as the passages of the fluid.

FIG. 16 is a cross-sectional view taken along the arrow 124 of FIG. 12, in which the fixed gear 104 is contained in the casing 112, and the gear block 106 is disposed on both sides of the fixed gear 104. In contact with this end, it can be seen that the interior is divided into the inlet and outlet sides.

FIG. 17 is a cross-sectional view taken along the arrow 125 of FIG. 12, in which the gear block 106 penetrates inside the gear block cover 113 and shows two holes through which fluid flows to the inlet and the outlet.

12 to 17, it can be seen that the fluid does not leak, and it can be seen from FIG. 14 that the fluid flows when the gear rotates, and the moving gear 102 and the moving gear ring 105 in the casing 112. And the position of the gear block 106 can be confirmed that the discharge amount can be adjusted.

18 shows a fixed gear 181 constituting a variable displacement internal gear pump, and FIG. 19 shows a gear block 191, a moving crescent plate 192, a fixed crescent plate hole 196, and a moving gear ring 193. , The anti-separation plate 194 and the shaft fixing device 195 are shown, FIG. 20 shows the fixed gear ring 201 and the moving gear 202, and FIG. 21 shows the casing 211 and the casing cover 212. , The fixed gear ring cover 213, the fixed crescent plate 214, and the moving crescent plate hole 217 are shown. The moving crescent plate 192 is attached to the gear block 191 and the shape of the moving gear ring 193 assembled to the gear block 191 can be seen in FIG. 21. The separation prevention plate 194 is assembled after inserting the moving gear ring 193 to the gear block 191, and the diameter is slightly larger than the gear block 191 so that the gear ring 193 does not leave the gear block 191. . The shaft fixation device 195 keeps the gear block 191 in contact with the side of the moving gear 202 and in a constant position on the moving gear shaft 203. The moving gear ring 193 can be inserted into the fixed gear 181 and move left and right, and fluid does not leak when it moves. The fixed gear ring 201 is fitted to the outside of the moving gear 202 to move from side to side, and fluid does not leak when moving. The fixed crescent plate 214 is attached to the fixed gear ring cover 213, the fixed crescent plate 214 and the moving crescent plate 192 move left and right in contact with each other. In addition, the fixed crescent plate 214 touches this end of the moving gear 202 upwards and moves through the fixed crescent plate hole 196, and the moving crescent plate 192 touches this end of the fixed gear 181 downwards. It moves through the moving crescent plate hole 217. As the moving gear 202, the gear block 191, the moving gear ring 193, and the moving crescent plate 192 move left and right together, the width at which the two gears are engaged is changed to change the discharge amount.

As shown in FIG. 22, the fixed crescent plate 214 and the moving crescent plate 192 move to make contact with each other so as not to be separated from each other to make irregularities such as the moving crescent plate concave row 221 and the fixed crescent plate convex row 222. It is good. This also helps to prevent the gear block 191 from rotating along the moving gear 202 and the moving gear ring 193. The gear block 191 is in contact with the moving gear ring 193 while supporting one side of the moving gear shaft 203 and receives a lot of rotational force. The moving crescent plate 192 penetrates the moving crescent plate hole 217, the fixed crescent plate 214 penetrates the fixed crescent plate hole 196 and the moving crescent plate concave row 221 and the fixed crescent plate convex row. If the gear block 191 is not able to receive sufficient force to prevent the gear block 191 from rotating through the unevenness, such as 222, a method of supporting the moving gear shaft 203 more firmly from the outside may be used. 203 rotates only the moving gear 202 without rotation, and may firmly fix the gear block 191 to the moving gear shaft 203, and remove the fixed gear shaft 182 from the fixed gear 181. To make a large hole in the center of the fixed gear plate 183, change the casing cover 212 like the gear block cover 113 of Figure 11, the gear block 191 or the departure prevention plate 194 in Figure 10 Can be used by pasting blocks of the same shape as the gear block 106 shown There is also. In this case, the moving gear shaft 203 is responsible for the transmission of the rotational force.

Figure 23 shows a cross section of the assembled variable displacement internal gear pump in operation. It is a cross section cut out at the arrow position of 251 in FIG. In order to show the assembly and operation state in more detail, the cross-sections seen from the positions 231 to 235 are shown again in FIGS. 24 to 28, respectively. As the gear block 191 and the moving gear ring 193 move side to side together, the space between the gear block 191 and the fixed gear plate 183 requires free entry of air to maintain a constant air pressure. . It is preferable to drill an air hole in the fixed gear plate 183.

FIG. 24 is a cross-sectional view taken along the arrow 231 of FIG. 23, in which the large gear hole of the fixed gear ring cover 213 contains the fixed gear ring 201, and the moving gear 202 is fitted into the fixed gear ring 201. In addition, it can be seen that the moving crescent plate 192 penetrates the moving crescent plate hole 217 of the fixed gear ring cover 213.

FIG. 25 is a cross-sectional view taken along the arrow 232 of FIG. 23, in which the fixed gear 181 meshes with the moving gear 202 in the casing 211, and the fixed gear 181 and the moving crescent plate are located on opposite sides of the gear. It can be seen that 192, the fixed crescent plate 214, and the moving gear 202 touch one after another. When it rotates, it acts as a pump.

FIG. 26 is a cross-sectional view taken along the arrow 233 of FIG. 23, in which a moving gear ring 193 is fitted to the fixed gear 181 inside the casing 211, and the gear block 191 is inserted into the moving gear ring 193. It is seen that the movable gear shaft 203 penetrates through the round hole of the gear block 191, and the fixed crescent plate 214 penetrates the fixed crescent plate hole 196. It can be seen that the fluid is prevented from leaking out at the position where the fixed gear 181 and the movable gear 202 are engaged.

FIG. 27 is a cross-sectional view taken along the arrow 234 of FIG. 23, where the fixed gear plate 183 can be seen inside the casing 211.

FIG. 28 is a cross-sectional view taken at the arrow 235 of FIG. 23, where the casing cover 212 and the fixed gear shaft 182 can be seen.

It can be seen from Figures 23 to 26 that the fluid does not leak, it can be seen that the fluid flows when the gear rotates through Figure 25, the moving gear 202, the gear block 191 in the casing 211 It can be seen that the discharge amount can be adjusted by adjusting the positions of the moving gear ring 193 and the moving crescent plate 192.

FIG. 29 shows a passage for leaking fluid which is not well known in the conventional variable displacement external gear pump. Among the conventional variable displacement external gear pumps, fixed gears, shifting gears and gear blocks meet at one end at the edge where the fixed gear and the shifting gear are engaged, and FIG. 29 shows fixed and shift gears of such a variable displacement external gear pump. And around where the gear blocks meet. In the figure, the left side of the fixed gear 291 is engaged with the moving gear 292, the right side is in contact with the gear block 293, the moving gear 292 and the gear block 293 also in contact with each other. The high pressure portion and the low pressure portion are divided by the tangential line 295 of the fixed gear and the moving gear, which are drawn by the imaginary line, and the fluid cannot cross the tangent 295 of the fixed gear and the moving gear. The fixed gear circumferential line 294 drawn in dotted lines depicts the point where the end edge of the moving gear 292 touches when the fixed gear 291 rotates. If the teeth of the fixed gear 291 and the corrugated surface of the fixed gear 291 around the center of the point where the gear block 293 is in contact, the gear block 293, the right side of one tooth of the moving gear 292 and You can see that there is a closed column-shaped space surrounded by a casing cover, but in detail, the teeth of the shifting gear 292 on the left side of the space are tightly spaced between the two teeth of the fixed gear 291. There is a gap between right and left, not a right fit. It can be seen that there is a gap between the solid line indicating the edge of the moving gear 292 and the dotted line which is the circumferential line 294 of the fixed gear. This naturally occurs in gear meshing. The space is therefore not completely closed and two gaps open to the left, which are connected one by one to the high and low pressure parts of the pump. In other words, it can be seen that the high pressure portion and the low pressure portion of the pump communicate through the space on the right side of the moving gear 292. Therefore, if this gap is not blocked, the pressure in the high pressure portion of the pump and fluid will leak to the low pressure portion of the pump, and thus the pump may not function properly. Fig. 29 is drawn for the variable displacement external gear pump, but can also be applied to the variable displacement trocoid gear pump, and there are actually the same problems in the variable displacement trocoid gear pump. 29 is adapted to a variable displacement trocoid gear pump, 291 is a fixed gear or outer rotor, 292 is a moving gear or inner rotor, 293 is a gear block or active piston. Similarly, Fig. 29 can be applied to a variable displacement internal gear pump as well, and there are actually the same problems among the variable displacement internal gear pumps. 29 is adapted to the variable displacement internal gear pump, 291 is a fixed gear, 292 is a moving gear, and 293 is a gear block.

31 to 41 show a method of supporting the gear block 321 more firmly so as not to rotate by changing things shown in FIGS. 18 to 28 little by little.

31 shows a fixed gear 311 and a fixed gear plate 313. Compared with Fig. 18, there is no fixed gear shaft 182, and the fixed gear plate 313 also has a large hole in the center.

32 shows that the gear block support plate 328 is attached to the gear block 321 as compared to FIG. 19. Since the departure prevention plate 324 is firmly fixed to the gear block 321, the gear block support plate 328 may be attached to the departure prevention plate 324. In addition, the separation prevention plate 324 has a gear block support plate hole 329.

33 shows a slightly longer moving gear shaft 333 as compared to FIG. 20.

FIG. 34 shows that the gear block support plate hole 348 is formed in the casing cover 342 and the gear block support plate 328 is attached to the gear block 321 in comparison with FIG. 21. The gear block support plate 328 will move through the gear block support plate hole 348.

35 is not different from FIG. 22.

36 shows a cross section of the assembled variable displacement internal gear pump in operation. It is a cross section cut at the arrow position of 381 of FIG. In order to show the assembly and operation state in more detail, the cross sections seen from the positions 361 to 365 are shown again in FIGS. 37 to 41, respectively.

FIG. 37 is a cross-sectional view taken along the arrow 361 of FIG. 36, and will not be described differently from FIG. 24.

FIG. 38 is a cross-sectional view taken along the arrow 362 of FIG. 36, and will not be described differently from FIG. 25.

FIG. 39 is a cross-sectional view taken along the arrow 363 of FIG. 36, and will not be different from FIG. 26.

FIG. 40 is a cross-sectional view taken along the arrow 364 of FIG. 36, and it can be seen that there is a fixed gear plate 313, a gear block support plate 328, and a moving gear shaft 333 inside the casing 211.

FIG. 41 is a cross-sectional view taken along the arrow 365 of FIG. 36, and it is seen that the gear block support plate 328 is formed on the casing cover 342 and the moving gear shaft 333 is present.

36 to 39, it can be seen that the fluid does not leak, and through FIG. 38, it can be seen that the fluid flows when the gear rotates. The moving gear 332 and the gear block 321 in the casing 211. It can be seen that the discharge amount can be adjusted by adjusting the positions of the moving gear ring 193 and the moving crescent plate 322.

FIG. 42 shows a variation of the variable displacement external gear pump shown in FIG. 8. The shape of the gear blocks 85 and 86 shown in FIG. 8 is changed in the same manner as the fixed gear block 425 and the moving gear block 426 so that the two directly touch each other, and the gear block holes 73 and 74 shown in FIG. The shape is changed like the fixed gear block hole 423 and the moving gear block hole 424. This eliminates the need for the casing 22 shown in FIG. If the variable displacement external gear pump shown in FIG. 8 required precise machining of the bottom, the variable displacement external gear pump of FIG. 42 is freed from the bottom, and can be more easily installed in the bottom of the oil tank or the bottom of the crankcase. If there is no casing, the two gears must be operated while sufficiently submerged in the fluid, and the fluid hole 427 can be used as a discharge port or a suction port by connecting pipes.

43 shows the fixed cover 21, the casing 22, the moving cover 23, and the moving gear block 24 shown in FIG. 2, respectively, and the fixed cover 431, the casing 432, the moving cover 433, and the moving cover 24. It is shown that the casing 434 is changed so that the gear block and the gear block hole are not used. A portion of the casing 432 in which the end of the moving gear is in contact with it is referred to as a fixed casing 438. The fixed gear, the shift gear, the fixed gear ring and the shift gear ring can be used as shown in FIG. 1 as it is to make a variable displacement external gear pump. It can be used in an environment where it is easier to process the moving casing than to machine the gear block and the gear block hole.

FIG. 44 is a sectional view when the variable displacement external gear pump is constructed from those shown in FIG. 1 and those shown in FIG. 43.

FIG. 45 shows a structure in which the casing 432 does not use the casing 432 compared to the method shown in FIG. 43. The fixed gear, the shift gear, the fixed gear ring and the shift gear ring can be used as shown in FIG. 1 as it is to make a variable displacement external gear pump. The fixed casing 455 and the moving casing 456 are laterally touching each other so that fluid does not leak between them. It is recommended to operate while submerged in fluid.

Variable displacement gear pumps can be used to maintain a constant flow of fluid when the rotational speed of the shaft changes frequently, such as in an automobile oil pump. In addition, while the rotational speed of the shaft changes greatly, such as an air conditioner of an automobile, the flow of fluid can be used when a large change is required regardless of the rotating speed of the shaft. In a refrigerator or an air conditioner using an AC motor, when the measured temperature approaches a set temperature, the discharge amount of the refrigerant may be gradually reduced to use it to finely adjust the temperature. This is because the AC motor has difficulty in adjusting the rotational speed and is easily turned off and then on to adjust the temperature, so that the temperature change can be large around the set temperature. It can be used as a pump in a place where the change of flow volume is large. An endless power distribution device can be created and used in a tank, bulldozer, or forkrain, where it is necessary to divert the direction of each other during the rotation of the left and right wheels. In a typical car, if both driving wheels are connected to the hydraulic motors, the left and right differentials according to the direction change of the car can be actively realized. In hydraulic systems, variable displacement gear pumps can easily implement changes in flow rate and hydraulic pressure, while variable displacement gear motors can easily implement changes in torque. You can also use it to create a continuously variable transmission.

Claims

In a variable displacement gear pump,

A fixed gear rotating in a fixed position;

A moving gear movable in the axial direction;

A fixed gear ring movable on the outer side of the moving gear in an axial direction;

A movable gear ring movable on the outer surface of the fixed gear and axially movable;

A fixed cover having a hole in which the fixed gear ring rotates;

A moving cover having a hole in which the moving gear ring rotates;

A fixed gear block attached to the fixed cover; And

Including a moving gear block attached to the moving cover,

The fixed gear and the shifting gear mesh with each other, the shifting gear ring on the outer side of the fixed gear rotates in the hole of the shifting cover, the shifting gear ring on the outer side of the shifting gear rotates in the hole of the shifting cover, the shifting gear shifts the shifting cover And, variable displacement gear pump characterized in that it moves in the axial direction of the gear together with the moving gear, the moving gear block to adjust the discharge amount in accordance with one rotation of the gear by changing the width in which the fixed gear and the moving gear mesh.
The method according to claim 1,

A variable displacement gear pump comprising a fixed gear block as a fixed casing and a moving gear block as a moving casing.
In a variable displacement gear pump,

A fixed gear rotating in a fixed position;

A moving gear with one tooth less than the fixed gear and movable in the axial direction;

A fixed gear ring movable on the outer side of the moving gear in an axial direction;

A movable gear ring movable in the axial direction by being inserted into the fixed gear;

A gear block which is movable in the axial direction by sandwiching the movable gear ring on the outside and in the fixed gear;

A casing containing the fixed gear, the shift gear, the shift gear ring and the gear block;

A gear ring cover having a hole in which the fixed gear ring rotates; And

And a gear block cover having a hole into and out of the gear block and a fluid suction hole and a fluid discharge hole.

The fixed gear and the moving gear mesh with each other, the fixed gear ring fitted on the outside of the moving gear rotates in the hole of the gear ring cover, and the moving gear ring and the gear block are inserted into the fixed gear so as to be in contact with the side of the moving gear, It rotates with the fixed gear, the gear block moves through the hole of the gear block cover while contacting this end of the fixed gear, the moving gear, the moving gear ring and the gear block move together in the axial direction of the gear so that the fixed gear and the moving gear The variable displacement gear pump, characterized in that for adjusting the discharge amount according to one rotation of the gear by changing the engaging width.
In a variable displacement gear pump,

A fixed gear rotating in a fixed position;

A moving gear movable in the axial direction;

A fixed gear ring movable on the outer side of the moving gear in an axial direction;

A movable gear ring movable in the axial direction by being inserted into the fixed gear;

A gear block with a fixed crescent plate hole and fitted into the moving gear ring;

A fixed gear ring cover having a hole in which the fixed gear ring rotates and a moving crescent plate hole;

A moving crescent plate attached to the gear block;

A fixed crescent plate attached to a fixed gear ring cover; And

A casing containing a fixed gear, a moving gear, a moving gear ring, a gear block, a fixed crescent plate, and a moving crescent plate;

The fixed gear and the moving gear mesh with each other, the outer fixed gear ring of the moving gear rotates in the hole of the fixed gear ring cover, the fixed crescent plate is in contact with the moving gear, the moving crescent plate is in contact with the fixed crescent plate and the fixed gear The moving gear ring and the gear block are in contact with the side of the moving gear, the moving gear ring rotates with the fixed gear, and the moving gear, the moving gear ring, the gear block and the moving crescent plate move together in the axial direction of the gear to move with the fixed gear Variable displacement gear pump, characterized in that for adjusting the discharge amount in accordance with one rotation of the gear by changing the width in which the gear is engaged.
The method according to claim 4,

A casing cover having a gear block support plate and a gear block support plate hole;

A variable displacement gear pump comprising a gear block support plate attached to the gear block and allowing the gear block support plate to penetrate through the hole of the gear block support plate in the casing cover.
In a variable displacement gear pump,

A fixed gear rotating in a fixed position;

Two moving gears axially movable;

Two fixed gear rings movable on the outer surface of the shift gear in the axial direction;

A movable gear ring movable on the outer surface of the fixed gear and axially movable;

Two fixed covers with holes through which the fixed gear rings rotate;

A moving cover having a hole in which the moving gear ring rotates;

A fixed gear block attached to the fixed cover; And

Including two moving gear blocks attached to the moving cover,

Two shifting gears are connected in a straight line on both sides with the shifting cover in between, and the outer fixed gear ring of each shifting gear rotates in the hole of the respective fixed cover, and the shifting gear ring of the fixed gear is shifted Rotating in the hole of the fixed gear and two shifting gears, the two shifting gears move together in the axial direction of the gears with the shifting cover, the shifting gear ring and the two shifting gear blocks, so that the fixed gears and the shifting gears engage Variable displacement gear pump, characterized in that for adjusting the discharge amount of each discharge port in accordance with one rotation of the gear.
The method according to claim 6,

A variable displacement gear pump comprising a fixed gear block as a fixed casing and two moving gear blocks as two moving casings.